Fish Surveys

Published

May 5, 2024

Metadata

Figure 1: Location of fish surveys

Table 1: Summary of work by island and exposure

Number of fish surveys per location, habitat, and exposure
	Exposure	Strata	# Sites	# Transects	# Reels	Surveyed distance (m)
Fanna
Forereef	Leeward	2	1	2	6	150
Forereef	Windward	2	5	10	30	750
Total	—	—	6	12	36	900
Helen
Backreef	Lagoon	1	1	2	6	150
Patchreef	Lagoon	2	3	6	18	450
Forereef	Leeward	2	6	12	36	900
Forereef	Windward	2	5	10	30	750
Total	—	—	15	30	90	2250
Merir
Forereef	Leeward	2	3	6	18	450
Forereef	Windward	2	4	8	24	600
Total	—	—	7	14	42	1050
Pulo Anna
Forereef	Leeward	2	2	4	12	300
Forereef	Windward	2	2	4	12	300
Total	—	—	4	8	24	600
Sonsorol
Forereef	Leeward	2	4	8	24	600
Forereef	Windward	2	3	6	18	450
Total	—	—	7	14	42	1050
Tobi
Forereef	Leeward	2	5	10	30	750
Forereef	Windward	2	1	2	6	150
Total	—	—	6	12	36	900
Grand total	—	—	45	90	270	6750

Table 2: Summary of results by island and depth strata.

Average species richness, abundance, and biomass by location
	Sites	# Transects	# Reels	# Taxa	Abundance (ind/m2)	Biomass (g/m2)
Fanna
Deep	6	6	18	77.50	13.76	751.83
Shallow	6	6	18	60.83	14.36	328.81
Overall	—	12	36	69	14	540
Helen
Deep	14	15	45	67.80	6.82	696.49
Shallow	14	15	45	74.87	9.73	646.62
Overall	—	30	90	71	8	672
Merir
Deep	7	7	21	67.57	6.33	875.68
Shallow	7	7	21	73.43	5.68	697.21
Overall	—	14	42	70	6	786
Pulo Anna
Deep	4	4	12	61.25	17.72	1431.37
Shallow	4	4	12	67.50	10.43	756.46
Overall	—	8	24	64	14	1094
Sonsorol
Deep	7	7	21	72.57	17.38	552.88
Shallow	7	7	21	64.00	17.22	422.41
Overall	—	14	42	68	17	488
Tobi
Deep	6	6	18	69.50	7.87	879.63
Shallow	6	6	18	73.17	13.96	676.63
Overall	—	12	36	71	11	778

Figure 2: Number of species by order and family

Table 3: Results of Adonis model for univariate analysis of fish species richness

Results of Adonis model for univariate analysis of fish species richness
	df	SumOfSqs	R2	statistic	p.value
depth_strata	1	17.187	0.001	0.134	0.721
location	5	700.063	0.061	1.095	0.391
exposure	1	865.000	0.075	6.763	0.018
habitat	1	17.074	0.001	0.133	0.701
diver	1	18.771	0.002	0.147	0.700
Residual	79	10104.930	0.877	NA	NA
Total	89	11527.156	1.000	NA	NA

Table 4: Results of Adonis model for univariate analysis of fish abundance

Results of Adonis model for univariate analysis of fish abundance
	df	SumOfSqs	R2	statistic	p.value
depth_strata	1	29.318	0.006	0.767	0.399
location	5	1245.230	0.235	6.515	0.001
exposure	1	229.449	0.043	6.003	0.017
habitat	1	2.019	0.000	0.053	0.797
diver	1	695.530	0.132	18.196	0.001
Residual	79	3019.706	0.571	NA	NA
Total	89	5289.048	1.000	NA	NA

Table 5: Results of Adonis model for univariate analysis of fish biomass

Results of Adonis model for univariate analysis of fish biomass
	df	SumOfSqs	R2	statistic	p.value
diver	1	281913.07	0.015	2.014	0.161
depth_strata	1	965942.72	0.051	6.899	0.009
habitat	1	16539.82	0.001	0.118	0.716
exposure	1	1580881.99	0.084	11.291	0.001
location	5	3247391.55	0.173	4.639	0.001
Residual	79	11060545.73	0.588	NA	NA
Total	89	18812734.31	1.000	NA	NA

Table 6: Summary of results by island and exposure

Average species richness, abundance, and biomass by location and exposure
	Sites	# Transects	# Reels	# Taxa	Abundance (ind/m2)	Biomass (g/m2)
Fanna
Leeward	1	2	6	69.50	10.40	812.14
Windward	5	10	30	69.10	14.79	485.95
Helen
Lagoon	4	8	24	67.88	8.04	191.03
Leeward	6	12	36	66.42	6.01	544.84
Windward	5	10	30	80.00	11.18	1208.03
Merir
Leeward	3	6	18	68.17	5.40	867.84
Windward	4	8	24	72.25	6.46	725.40
Pulo Anna
Leeward	2	4	12	62.00	13.51	667.86
Windward	2	4	12	66.75	14.64	1519.97
Sonsorol
Leeward	4	8	24	65.50	13.97	399.07
Windward	3	6	18	72.00	21.74	605.73
Tobi
Leeward	5	10	30	70.90	11.36	749.79
Windward	1	2	6	73.50	8.67	919.82

Figure 11: Biomass by family

Figure 12: Biomass by family and depth strata

Figure 13: Biomass by trophic group

Figure 14: Frequency, abundance, and biomass by species

Table 7: Fish assemblages Adonis model

Table 8: Results of ANOVA on the ordination model